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	<title>设备响应式</title>
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      .demo {
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    <h1>设备响应式</h1>
    <pre>
      1. 隐藏：.hidden-xs, .hidden-sm, .hidden-md, .visible-lg
      2. 可见：.visible-xs-*, .visible-sm-*, .visible-md-*, .visible-lg-*
      3. 变体：.visible-xs-block, .visible-xs-inline, .visible-xs-inline-block
    </pre>
    <div class="row visible-on">
      <div class="col-xs-6 col-sm-3 demo">
        <span class="hidden-xs">.hidden-xs</span>
        <span class="visible-xs">&radic; .visible-xs</span>
      </div>
      <div class="col-xs-6 col-sm-3 demo">
        <span class="hidden-sm">.hidden-sm</span>
        <span class="visible-sm">&radic; .visible-sm</span>
      </div>
      <div class="clearfix visible-xs"></div>
      <div class="col-xs-6 col-sm-3 demo">
        <span class="hidden-md">.hidden-md</span>
        <span class="visible-md">&radic; .visible-md</span>
      </div>
      <div class="col-xs-6 col-sm-3 demo">
        <span class="hidden-lg">.hidden-lg</span>
        <span class="visible-lg">&radic; .visible-lg</span>
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